This CT-DH-1 is designed to turn On and Off exhaust fans and/or intake fans to remove unwanted atmosphere due to heat or humidity. This device is intended as a cooling and dehumidifying control. This controller is ideal for situations where excess heat and humidity need to be exhausted. Internal sensors will allow a 7 temperature comfort zone and a 7% humidity spa(differential) between the time the fans go off and come back on again. When either temperature or humidity exceeds the dial settings, all four outlets will turn ON, activating any cooling or exhaust equipment plugged into the controller.